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51 lines
2.1 KiB
51 lines
2.1 KiB
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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/**
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* @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
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* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
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*
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* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
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* presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
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* need to send a transaction, and thus is not required to hold Ether at all.
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*/
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interface IERC20Permit {
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/**
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* @dev Sets `value` as the allowance of `spender` over `owner`'s tokens,
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* given `owner`'s signed approval.
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*
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* IMPORTANT: The same issues {IERC20-approve} has related to transaction
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* ordering also apply here.
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*
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* Emits an {Approval} event.
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*
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* Requirements:
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*
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* - `spender` cannot be the zero address.
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* - `deadline` must be a timestamp in the future.
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* - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
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* over the EIP712-formatted function arguments.
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* - the signature must use ``owner``'s current nonce (see {nonces}).
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*
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* For more information on the signature format, see the
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* https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
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* section].
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*/
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function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
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/**
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* @dev Returns the current nonce for `owner`. This value must be
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* included whenever a signature is generated for {permit}.
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*
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* Every successful call to {permit} increases ``owner``'s nonce by one. This
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* prevents a signature from being used multiple times.
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*/
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function nonces(address owner) external view returns (uint256);
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/**
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* @dev Returns the domain separator used in the encoding of the signature for `permit`, as defined by {EIP712}.
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*/
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// solhint-disable-next-line func-name-mixedcase
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function DOMAIN_SEPARATOR() external view returns (bytes32);
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}
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